Drill-steel-retaining device.



C. A. HULTQUISI. DRILL STEEL RETAINING DEVICE. APPLICATION FILED MAR. 26 |917.

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LIES A. HULTQUIST, OF LOS ANGELES, CALIFORNA.

DRlILL-STEEL-RETAINING DEVICE.

Specification of Letters Patent.

Patented aan. as, raie.

Application led March 26, 1917. Serial No. 157,350.

Angeles and State of California, have in-4 vented a new and useful Drill-Steel-Retaining Device, of which' the following is a specification.

This invention relates to devices of the character designed to prevent the drill steel from becoming detached Vfrom the chuck in which it is loosely seated, as in various types of drilling machines, and an object of this invention is to produce a device of this character of simple construction and one that is easily and quickly thrown into and out of commission so that the drill steel can be quickly attached and detached.

Another object is to produce a device of this character which is more or less yielding axially of the drill steel which it is to retain so that in drilling when the drill steell strikes comparatively soft material or penetrates a hole or crevice in the rock the blow of the hammeron the drill steel will be absorbed to some extent by the drill steel retainer so as to minimize liability of breakage of the retainer and the parts of the drilling machine with which said retainer is connected.

Another objectis to rovide a construction which will enable t 1e driller to readily grasp the device for throwing it into and out of commission.

Another object is to so construct the device that a comparatively'small amount of pressure exerted by the drillers hand will release the drill sigel retaining member so that it can be readily swung out of drill steel retaining osition.

lln so far as t e foregoing objects are concerned thisapplication is a continuation of my -co-pending application for patent for v pneumatic tool filed July 3, 1916, Serial No. 107,361.

A further object of the invention is to facilitate attaching and `detaching of the drill steel retaining member from its bracket' without detaching the bracket from. the drilling machine.

@ther objects and advantages will appear in the subjoned detail description.

'llhe accompanying drawings illustrate the invention: f o

f Figure 1 is a' side elevation of a drilling machine equipped with the improved drill steel retaining device. l'

Fig. 2 is an enlarged elevation of the drill steel retaining device from the right of Fig.

1, the lower portion of the drilling machine also being shown.

Fig. 3 is a view similar to Fig. 2, portions being shown in vertical mid section for clearness of illustration.

Fig. 4 is a plan view of Fig. 2.

Fig. 5 is a plan section on line indicated by :aL-x5, Fig. 3.

ln Fig. 1 the drill steel is indicated at 1 and is provided as usual with a shoulder or abutment 2 spaced apart from its head and which is inserted in a barrel 3 of a drilling machine indicated in general by the character 4. The drilling machine 4 in the instance shown is of the type employed for drilling down holes, but it is understood that the invention is applicable to other types of drilling machines. rl`he drill steel 1 can readily slide in and out of the barrel 3, as is usual and readily understood, and to retain the drill in place so that it cannot become detached from the drilling machine, unless desirable, the outer face of the abutment 2 engages a semicircular abutment 5 which partly surrounds the drill steel when said drill steel is in place as in Fig. 1.

'llhe semicircular abutment 5 forms the intermediate portion of a lll-shaped member which also comprises arms 6. rll`he arms 6 are provided with curved or semicircular intermediate portions 7, curved portions 8 connecting the portions 7 to the semicircular portion 5, straight portions 9 and outwardly bent end portions forming pivots 10 for the arms, said pivots being detachably inserted in pivot seats in the form of perforations 11 in lugs 12 of a bracket 13.

The arms 6 and semicircular abutment 5, in the instance shown in .the drawings, are integral with one another and are formed of a rod, bar or heavy wire so as to be more or less rigid yet having more or less spring quality and capable of being sprung together so that when so sprung the pivots l0 can be withdrawn from the perforations 11; and capable of being sprung to some extent axially of the drill steel 1 so as to absorb shocks transmitted from the abutment 2 to the circular abutment 5 when the drilling machine is in operation. .s

'll` he bracket 13 is connected with the barliti lll@

rel 3 of the drilling machine and, in the instance shown, for the connection said bracket comprises besides the lugs 12 a collar 14 'having an axial perforation l5. The barrel 3 is in sections, one section 16 having a reduced portion 17 adapted to fitv in the perforation 15 and inside of another barrel section 18. yAt the inner end of the reduced portion 17 is an annular shoulder 19 and the bracket collar 14 seats between said shoulder 19 and the adjacent end of the barrel section 18 when the sections 16, 18 are assembled as clearly shown in Fig. 3. The collar 14 is provided with an outstanding ear 420 having a notch 21 to accommo- ,date one of the bolts 22, said bolts 22 being of the character .commonly employed in drilling machines for holding the barrel sections together in a manner Well understood in the art and therefore not' necessary to describe in detail herein. It is readily seen from the foregoing that owing to the bolt 22 and notch 21 the collar 14 and its lug 12 are prevented from turning relative to the barrel of the drilling machine.

The arms 6 when in position parallel with' the axis of the drill steel and therefore in drill-retaining position, as in Fig. 1, are held against swinging away from said position by reason of the `outer faces of the straight portions 9 of the arms engaging grooves 23 on the inner faces of the lugs 12. The arms 6 being of spring material, it is clear that by the construction just described said arms cannot become accidentally detached from the bracket but may be readily turned, when sprung out of the grooves 23 so as to bring the abutment 5 to one side o the device to permit removal of the drill steel 1 when such removal becomes desirable.

The distances between the inner faces of the arms 6 and the barrel 3 are less than the lengths of the pivots 10 so that when the arms 6 are either in their drill-retaining position or in the drill-releasing position indicated at a, Fig. 1, the pivots 10 cannot be disengaged from the perforations 11.

The foregoing described construction is a continuation of the hereinbefore mentioned co-pending application for patent.

It may be desirable, in case of breakage of the drill-steel retaining member 5, 6 or for other reasons, to attach o-r detach the drillretaining member, and for that purpose the inner faces of the lugs 12 are provided at right angles to the grooves 23 with grooves 24 extending from the pivot seats 11 to one longitudinal edge of the lugs 12. These grooves 24 are in such position that when the drill-retaining member 5, 6 is turned to the position indicated in dotted lines D, Fig. 1, the ivots 10, after springing the` arms 6 towar one another, can be withdrawn from the perforations 11 through the grooves 24 for the reason that the distances from the bottom of the grooves 24 Yto the barrel 3 are greater than the lengths of the pivots 10.

ln practice, when it is desired to detach the drill from the drill-retaining member 5, 6. said member will be swung from the position shown in solid lines in Fig. 1 to the position indicated at a, thus freeing the abutment 2 of the retaining abutment 5, and allowing the drill to be withdrawn from the barrel. When it is desired to insert the drill steel the foregoing operations will be Vreversed so as to bring the drill retaining n vember to the position shown in solid lines in Fig. 1.

When it is desired to detach'the drill-retaining member 5, 6 the operator, after removing the drill steel 1 as above explained, will move thedrill-retaining member 5, 6 to the position indicated at b to bring the straight arm portions 9 in registration with the grooves 24, and he will press the arms 6 toward one another suiiciently to withdraw the pivots 10* from their seats 11 and he will i then draw the arms 6 away from the lugs 12 so as to move the pivots away from their seats through the grooves 24. l

To insert the drill-retaining member 5, 6 a reversal of the operation just described will be effected.

It is clear that when the drill-retaining member is in drill-retainingv position any blow on the drill steel 1 delivered by the machine in a manner well understood in the art, if the abutment 2 comes into engagement with the abutment 5, will be absorbed to a great extent by the curved portions 7 of the arms as they are sufficiently resilient to spring to some extent axially of the drill steel 1.

By forming the notches 23 at the outer faces of the arms 6 itis clear that the operator may readily release the arms from the r-otches with one hand by grasping the arms between the thumb and oreinger of one lzand and forcing said arms toward one another, thus the advantage of such construction is that it simplifies the. operation of moving the drill steel retainer in and out of drill steel holding position.

The foregoing will enable those skilled in the art to which the invention pertains to make and use said invention, and it is -undcrstood that changes may be made'within the spirit and scope of the appended claims and that the elements in said claims are subj ect to the doctrine of equivalents.

I claim:

1. The combination with the barrel of ay aaeaeae the abutment en a drill steel to retain said drill steel.,

2. In combination,

a sectional drilling maehme barrel, means to hold the sections to- 5 gether, one of said sections having a reduced.

portion inserted in the other section, a collar on the reduced portion, and drill-retaining means connected with the collar.

3. In combination, a sectional drilling ma- 10 chine barrel, bolts to hold the sections to- 1,5 connected with gether, one of said sectionshaving a reduced portion. inserted in the other section, al collar on the reduced portion having means to engage the bolts, and dri1l-retaining means the collan i 4f. rl`he combination with the barrel of a drilling machine, of a Ushaped drill-re taining member comprising spring arms pivotallyconnected with the barrel and comprising an abutment to engage the abutment on a drill steel, said arms having semi-circular portions and curvedportions connecting the semi-circular portions with the rst named abutment, and means at the outer face` of the arms\to detachably hold said arms in drill-retaining Position,

5.` A drill steel retaining device of the character described comprising a bracket 'pivoted in the lugs and having inner faces, and a 'drill-retaining member adapted to engage the grooves `vhen the member is in drili-retainlng position.

6. 'lhe combination with the barrel of a drilling machine, of a bracket having lugs provided lwith pivot seats and with grooves on the inner faces of said lugs, and a drill.n retaining member having pivots in the pivot seats and adapted to engage the groovee jvyhen the member is in drill-retaining Iposition, therebeing other grooves on the inner faces of the lugs respectively extending from the perforations to one edge of the lugs, the

distances between the bottoms of the first named grooves and the barrel being lesa than the lengths of the pivots and the dietances between the bottoms of the second named'grooves and the barrel being greater than the lengths of the ivots,

Signed at Los Ange es, California, this' l9th day of March, 19172 CHARLES A.. HULTQUEST.,

lugs previded with grooves on the a 

